Mark Ferdinand Treffers (born 16 December 1953) is a former swimming representative from New Zealand and 1974 Commonwealth Games gold medalist who specialised in long distance freestyle and medley races.

[2] At the 1970 British Commonwealth Games held in Edinburgh, he won the bronze medal in the 1500 m freestyle in a time of 16:44.69.

[3] Treffers would go on to claim a silver medal in the men's 1500m Freestyle, his main race, as he become just the seventh man in history to break 16 minutes finishing behind Australian Stephen Holland.

[5] Treffers studied law at the University of Canterbury while training for the Commonwealth Games before becoming a lawyer in Australia after retiring from swimming.

[3] Mark's son Ben Treffers represented Australia in swimming, winning a gold medal in the 50m Backstroke at the 2014 Glasgow Commonwealth Games.